<div class="doc-item" id="doc-712"><h2 class="doc-item-name">contains?<span class="namespace">(clojure.core)</span></h2><ul class="var-arglists"><li>(<span class="var-name">contains?</span> coll key)</li></ul><div class="var-docstring"><p>Returns true if key is present in the given collection, otherwise
  returns false.  Note that for numerically indexed collections like
  vectors and Java arrays, this tests if the numeric key is within the
  range of indexes. 'contains?' operates constant or logarithmic time;
  it will not perform a linear search for a value.  See also 'some'.</p></div><div class="var-source"><pre>; clojure/core.clj:877
(defn contains?
  [coll key] (. clojure.lang.RT (contains coll key)))</pre></div><div class="license"><p>Copyright (c) Rich Hickey. All rights reserved.</p><p>The use and distribution terms for this software are covered by the <a href="http://opensource.org/licenses/eclipse-1.0.php">Eclipse Public License 1.0</a>, which can be found in the file
          epl-v10.html at the root of this distribution. By using this software
          in any fashion, you are agreeing to be bound by the terms of this
          license. You must not remove this notice, or any other, from this
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